Shading sign of endometrioma
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Menstrual disturbance for one month.
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T1 hyperintense cyst in the right ovary. T1 fat saturation showing that the hyperintensity is not fat but hemorrhage. T2 shading sign. In the sagittal plane, there is a large left ovarian cyst as well. A tortuous tubular hyperintensity is seen in the right adnexa, likely a hematosalpinx.
Shading sign is the magnetic resonance (MR) imaging finding of T2 shortening in an adnexal cyst that is hyperintense on T1-weighted images. It is helpful as a distinguishing feature of endometriotic cysts (endometriomas) on MR imaging.
- Glastonbury CM. The shading sign. (2002) Radiology. 224 (1): 199-201. doi:10.1148/radiol.2241010361 - Pubmed